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The first candidates for neutrino oscillation to tau neutrinos were announced in May 2010 by the OPERA experiment. In total five tau neutrinos were observed, consistent with the expectations from the theory of neutrino oscillation.On 22 September 2011, the OPERA collaboration garnered international attention when they released a preprint reporting the Faster-than-light neutrino anomaly, wherein neutrinos were measured to be travelling, on average, at faster-than-light speed. On 24 February 2012, the team said they had discovered two problems with their previous test, muddying the validity of the previous result. The preprint has been modified to account for these facts, and indeed the measurement of the neutrino speed, there reported, agrees with the velocity of the light.
Shortly thereafter the OPERA collaboration announced that it had conducted the experiment with two technical problems and the results were invalid.
this kind of neutrinos came to Earth from that supernova earlier than photons